Lifting-jack



V. R. KOONTZ.

LIF VAPPLxcMloN FILED ses. 1o. 1920.

TING JACK.

Patented Feb. 159 1921.

@tkm eg 'Il 'i VICTOR R. KOONTZ, W'AYNESBO'RO, PENNSYLVANIA.

LIFTINGJACK.

pasaras.

Specification of Letters Patent.

YPatented Feb. 15, 1921.

Application led February 10, 1920. Serial No. 357,762.

T @ZZ w 7mm it may concern:

- Be it known that I, VICTOR R. KooN'rZ, a citizen of the United States,residing at Waynesboro, in the county of Franklin and State ofPennsylvania, have invented certain new and useful improvements inLifting-Jacks, of which the following is a specification.

The present invention relatesl tok lifting jacks, particularly of thescrew type, and the object is to pro-vide a structure that is relativelysimple and veryV rigid and one that is not liable to become inoperative.

The preferred construction is illustrated in the accompanying drawings,wherein Figure 1 is a side elevation of the jack,

Fig. 2 is a vertical longitudinal sectional view therethrough,

'F ig. 3 is a plan view,

F ig. 4 is a cross sectional view substantially on the line 4-4 of Fig.2.

Similar'reference numerals designate corresponding parts in all thefigures of the drawings.

in the embodiment illustrated, a base is employed, to which is fixed astationary tubuia-r standard member 6, having external threads 7 andprovided with lopposite longitudinal slots 8.

Slidably mounted within the standard member 6 is a stein member 9 thatis also tubular, said member having a head 10 on its upper end. The stemmember is furthermore provided between its endswith across. pin 11, theends of which projectthrough the slots 8, as shown in Figs. 2 and 4.

Adjustably threaded on the exterior of the standard member 6 is avnut 12having an outstanding head portion 13, the periphery of which iscorrugated or roughened,as illustrated at 14, to provide a hand grip.rlhis head portion is also provided with an upstanding annular flange15, providing an internal guideway 16 and an external guideway 17. Theends of the cross pin 11 project into the internal guideway 16, and havejournaled thereon rollers 18 that bear upon the bottom of said guideway.A ring 19 is rotatable on the Vexternal guideway. The parts are held inplace by a cap plate 20 extending over both guideways 16 and 17, andheld in place by screws 21, or other suitable fasteners engaging theflange 15. The ring 19, on one side, cut away, as indicated at 22, andcarries an upstanding pivot pin 23 projecting into the cut-away member.

portion. mounted a handle lever 24, the inner end of which is in theform of a cam 25 adapted to operate against the periphery of the flange15. A portion of the cap plate 20 is cut away, as illustrated at 26 topermit the removal of the pivoted end of the lever 24, as will be clearby reference to Fig. 3.

llVith'this construction, it will be noted that if theY nut 12 isrotated in one direction or the other, it will move up or down on thestandard member 6, thereby longitudinally moving the stem member 9 insaid standard rlhe stem, member, however, is held `against rotation Vbyreason of the pin 11 operating in the slots 8, and the frictionalbearing between the pin and the nut is of course reduced by thel rollers18. TWhere the resistance to the movement is relativelylight, the nutcan be turned by the hand grip 14, or if the load is heavy, the lever 24can be applied and cooperating with the ring 19, will grip theflange 15of vthe nut, effecting a powerful step-by-step turning action. rThisrotation can be effected. in either direction accordingly as the handlelever 24 is placed upon the pivot pin. TWhen the handlelever is detachedit can, if desired, be placed within the hollow stem member 9, affordinga compact arrange nient for packing and transportation purposes.

VF rom the foregoing, it isthought that the construction, operation andmany advantages of the herein described invention will be apparent tothose skilled in the art, withlout further description, and it will beunderstood that various changes in the size, shape, proportion and minordetails of construction, may be resorted to without de- -parting fromthe spirit or sacricing any of the advantages of the invention.

From the foregoing, it is thought that the construction, operation andmany advantages of the herein described invention will be apparentto'those skilled in the art, without further description, and it ywillbe understood that various changes in the size, shape, proportion andminor details of construction may be resorted to without departing fromthe spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. in a lifting jack, a tubular standard,

On this pivot pin is detachaibiy a supporting stem slidably mountedinthe standard and projecting from one end of the same, an elevatingdevice movably mounted on the exterior of the standard and supportedthereby, and an operating connection between the portion of the stemwithin the standard and the operating device, said connection' extendinglaterally through the Wall of the standard and being movable therein. YY

2. In a lifting jack, a tubular standard, a supporting stem slidablymounted in the standard and projecting fromone end of the Same, anelevating device movably mounted on the exterior of the standard andSupported thereby, said standard having a longitudinal slot, and adevice carried by the stem and slidably projecting through the slot,theY projecting portion of said device being movably engaged by theelevating device.

3. In a lifting jack, the combination with an externally threadedtubular standard, of a stem slidably mounted therein, a nut adjustablythreaded on the standard, and a connection between the nut and stem thatpermits their relative rotation While maintaining them against materialrelative longitudinal movement.

4L;V In a lifting jack, the combination with an externally threadedtubular standard having opposite longitudinal slots, of a stemV slidablymounted in the standard, a mounting on the stem projecting through theslots, and an adjusting nut threaded on the standard and rotatablyengaging the mounting j Y to elfectthe relative movement of the standardand stem.

5'. In a lifting jack, theV combination with an externally threadedtubular standard having opposite longitudinal slots, of a stem slidablymounted in the standard, a cross pin on the stem projecting through theslots, an adjusting nut threaded on the Vstandard and having acontinuous bearing pin and operaton' the projecting ends of the pin andbearing against the nut. Y

7. In a lifting ack, an externally threaded standard member, a stemslidably mounted in the standard member and having a portion projectingtherefrom, a nutadjustably threaded on the standard member and having amovable bearing with the projecting portion, a ring rotatably mounted onthe nut around the said bearing, and a handle pivoted on' the ring andhaving a.

cam portion that grips the nut. j

8. n a lifting ack, the combinationwith an externally 'threaded standardVmember having a longitudinal slot, of va Vstem member slidably mountedinthe standard and having a portion projecting through the slot, a nutadj ustably threaded o n the standard and having internal and externalan-Z nular bearing surfaces, a roller bearing b'etween the projectingportion of the stem .and

the internal bearing surface, a ring rotatably mounted on the externalbearing surface, and a handle pivoted `on the ring and having a cam thatgripsthe 'externalfbearf ing surface. Y A

In testimony whereof Iaiiix 4myisignature Y in the presence of twowitnesses.

j vieron R. KooNTz. y Witnesses Y i PEARL RmENoUR, ,Y `Wirrson R.DoRsoN. 1

